Harrow tooth-bar.



Pa`tente'd Uct. `28, |902;

T. R. WALLIS.

HARnow TooTH BAR.

(Application led Mar. 14, 1902.)

(No Model.)

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UNITED STATES PATENT EEICE.

THOMAS RILEY WALLIS, .OF DYERSBURG, TENNESSEE.

HARRow TOOTH-BAR.

SPECIFICATION jformingpart of Letters Patent No. 712,221, dated October 28,1902. l

'Application ined March 14.1902. serai No. 98,188. (No man.)

To @ZZ whom, it may concern.-

Beit known that I, THOMAS RILEY WALLIS, a citizen of the United States, and a resident of Dyersburg, in the county of Dyer and State of Tennessee, have invented a new and lmproved Harrow Tooth-Bar, of which the following is a full, clear, and exact description.

My invention relates to a tooth-bar for metallic harrows.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification,

. in which similar characters of reference indicate corresponding parts in both figures.

Figure 1 is a side elevation, partly in section, of my device; and Fig. 2 is a vertical section upon the line 1 1 of Fig. 1, showing a tooth of the harrow in elevation.

The tooth-bar used is a composite structure made by bending a suitable piece of sheet metal into the gutter shape shown at 1 and bending another piece of sheet metal somewhat similarly, as shown at 2 in Fig. 2, and then fitting the two members together, so as to make a sort of tube. The lower part of this tube is provided with large apertures 3 and the upper part with relatively smaller apertures 4. The harrow-tooth 5 is provided with a substantially conical shank 6, terminating in screw-threads 7, which are engaged by the bolt 8. The teeth are secured' upon the bar by merely inserting the shanks themselves directly through the same and turning the bolt 8. The harrow tooth-bar thus formed is very strong and durable. The large hole being formed in the inner member enables this member to'be braced by the outer member. In other words, where the inner member is weakened because of the larger holes through it and because of the leverage exerted upon it by the tooth it is at the same time braced cles it and prevents any portionof it from springing out of place. It is believed that a maximum of lightness and strength and a minimum of weight are obtained by this construction. The peculiar gutter shape of the two members causes the strains to `be distributed to points where they can best be resisted.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. A harrow tooth-bar, comprising a pair of gutter-shaped members placed together so as to form a tube, each of said members being provided with a row of holes, a plurality of barrow-teeth provided with shanks for engaging said holes, and means for fastening said teeth within said holes.

2. A harrow tooth-bar comprising a pair of gutter-shaped members, each provided with a row of holes, the holes of one of said members differing in size from the holes of the other of said members, a plurality of harrowteeth provided with conical Shanks for en gaging said holes, and means for fastening said conical shanks within said holes.

3. A harrow tooth-bar, comprising a pair of gutter-shaped members, one of said members being partially fitted into the other so as to form a tube, the outer of said members being provided with small holes and the inner of said members being provided with relatively large holes, and a plurality of harrowteeth provided with tapering shanks to be inserted through said holes, and with shoulders and threaded nuts for securing said teeth to said bar.

In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

THOMAS RILEY WALLIS.

Witnesses:

JAS. S. PERRIN, SAM W. JOHNSTON.

-by the outer member, which partially encir- 

